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L6738ATR Arkusz danych(PDF) 18 Page - STMicroelectronics |
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L6738ATR Arkusz danych(HTML) 18 Page - STMicroelectronics |
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18 / 32 page  Output voltage setting and protections L6738A 18/32 Doc ID 18134 Rev 2 6.2 Overcurrent threshold setting The L6738A detects OC when the difference between CSP and CSN is equal to 20 mV (typ). By properly designing the current reading network, it is possible to program the OC threshold as desired (See Figure 6). Time constant matching is, in this case, designed considering: This means that once inductor has been chosen, the two conditions above define the proper values for R1 and R2. Figure 6. Current reading network I OCP 20mV DCR ---------------- R1 R2 + R2 ---------------------- ⋅ = L DCR ------------- R1//R2 () C ⋅ = L C R1 CSP CSN R2 (Opt) DCR |
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